Throughout the world, toxins produced by algae are responsible for approximately 60000 human food poisonings yearly. Shellfish toxins cause damage to wildlife and have a negative economic impact on recreation, tourism and shellfish industry, being almost a worldwide phenomenon. Dinoflagelates such as Dynophysis and Prorocentrum lima are considered a primary producer of diarhetic shellfish toxins, such as Okadaic Acid (OA) and Dinophysistoxins (DTXs), which can be accumulated in the tissues of the bivalves. Bioaccumulation process could increase the concentration of OA and DTXs at risky level, making bivalves unsafe for human consumption.